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Effects of bridging atom and π-bridge length on physical and photovoltaic properties of A-π-D-π-A oligomers for solution-processed organic solar cells

Luponosov YN, Min J, Bakirov AV, Dmitryakov PV, Chvalun SN, Peregudova SM, Ameri T, Brabec C, Ponomarenko SA (2015)

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Publication Type: Journal article

Publication year: 2015

Journal

Book Volume: 122

Pages Range: 213-223

DOI: 10.1016/j.dyepig.2015.06.026

Abstract

Synthesis of novel acceptor-donor-acceptor oligomers with electron-withdrawing alkyldicyanovinyl groups linked through an oligothiophene π-bridge with either dithienosilole or cyclopentadithiophene electron donor units is described. Changing the bridgehead atom from carbon to silicon in the central donor unit leads to a significant change in optical, thermal and structural properties of the oligomers. In addition, elongation of the oligothiophene π-bridge in the oligomers increases energies of HOMO and LUMO levels and leads to an unexpected hypsochromic shift of their absorption spectrum, because extension of the conjugation length cannot compensate a decrease of the intramolecular charge transfer between the dithienosilole and dicyanovinyl units. Although these minor changes in the chemical structures have a pronounced impact on the morphologies of their blends with PC70BM, the optimized solution-processed organic solar cells based on these small molecules demonstrate similar power conversion efficiencies.

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How to cite

APA:

Luponosov, Y.N., Min, J., Bakirov, A.V., Dmitryakov, P.V., Chvalun, S.N., Peregudova, S.M.,... Ponomarenko, S.A. (2015). Effects of bridging atom and π-bridge length on physical and photovoltaic properties of A-π-D-π-A oligomers for solution-processed organic solar cells. Dyes and Pigments, 122, 213-223. https://doi.org/10.1016/j.dyepig.2015.06.026

MLA:

Luponosov, Yuriy N., et al. "Effects of bridging atom and π-bridge length on physical and photovoltaic properties of A-π-D-π-A oligomers for solution-processed organic solar cells." Dyes and Pigments 122 (2015): 213-223.

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